| PSM 5 | |||
| Component | Symbol | Mole fraction | Uncertainty |
| Methane | CH4 | 69.621 × 10−2 | 0.018 × 10−3 |
| Carbon monoxide | CO | 0.076 × 10−6 | 0.037 × 10−6 |
| Carbon dioxide | CO2 | 0.076 × 10−6 | 0.037 × 10−6 |
| Total hydrocarbon | CxHy | 0.070 × 10−4 | 0.040 × 10−4 |
| Helium | He | 0.578 × 10−3 | 0.409 × 10−5 |
| Hydrogen | H2 | 0.246 × 10−2 | 0.014 × 10−3 |
| Water | H2O | 0.031 × 10−4 | 0.016 × 10−4 |
| Nitrogen | N2 | 0.094 × 10−4 | 0.050 × 10−4 |
| Oxygen | O2 | 0.020 × 10−4 | 0.010 × 10−4 |